Two-phase, Synchronous Step-down 3-channel Switching Regulator Controller - National Semiconductor

The LM2648 consists of two current mode and two voltage mode synchronous buck Regulator controllers providing 3 outputs at a switching frequency of 300kHz. Each pair of Switching Regulator controllers operate 180 out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two current mode Regulator outputs operate as a dual- phase, single output Regulator for high current applications. Current-mode feedback control on Channel 3 assures supe- rior line and load regulation and wide loop bandwidth as- sures excellent response to fast load transients. Channels 1 and 2 employ voltage-mode feedback control. The LM2648 features Analog soft-start circuitry that is inde- pendent of the output load and output capacitance. This makes the soft-start behavior more predictable than tradi- tional soft-start circuits. Sequential startup is built in and requires a single capacitor to set the Timing The LM2648 has over-voltage protection and under-voltage protection for all outputs. Two additional Comparator inputs (analog and Logic level) are provided to shut down the IC for any user defined protection. The FAULT_DELAY pin allows delayed shut off time for the IC during an under-voltage or PROT-IN2 fault. The LM2648 also features an adjustable UVLO feature. By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM26480SQX-AA/NOPB Texas Instruments Dual 2MHz 1.5A buck regulators and dual 300mA LDOs with individual enable and power good 24-WQFN -40 to 85
LM26480QSQX-CF/NOPB Texas Instruments Externally Configurable Dual 1.5A Step-Down DC/DC and Dual 300mA Linear Regulators 24-WQFN -40 to 125
LM26480QSQ-CF/NOPB Texas Instruments Externally configurable dual 1.5A step-down DC/DC and dual 300mA linear regulators 24-WQFN -40 to 125
LM26480SQ-BF/NOPB Texas Instruments Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators 24-WQFN
LM26484SQX/NOPB Texas Instruments Two DCDC and One LDO Configurable PMIC 24-WQFN -40 to 125
LM26480QSQX-AA/NOPB Texas Instruments Externally configurable dual 1.5A step-down DC/DC and dual 300mA linear regulators 24-WQFN -40 to 125
LM26484SQE/NOPB Texas Instruments Two DCDC and One LDO Configurable PMIC 24-WQFN -40 to 125
LM26480SQ-AA/NOPB Texas Instruments Dual 2MHz 1.5A buck regulators and dual 300mA LDOs with individual enable and power good 24-WQFN -40 to 85
LM26480QSQX-8D/NOPB Texas Instruments Externally configurable dual 1.5A step-down DC/DC and dual 300mA linear regulators 24-WQFN -40 to 85
LM26480QSQ-AA/NOPB Texas Instruments Externally configurable dual 1.5A step-down DC/DC and dual 300mA linear regulators 24-WQFN -40 to 125
LM2648 's PackagesLM2648 's pdf datasheet
LM2648MTD




LM2648 Pinout, Pinouts
LM2648 pinout,Pin out
This is one package pinout of LM2648,If you need more pinouts please download LM2648's pdf datasheet.

LM2648 Application circuits
LM2648 circuits
This is one application circuit of LM2648,If you need more circuits,please download LM2648's pdf datasheet.


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